<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Document</title>
    <style type="text/css">
        *{
            padding: 0px;
            margin: 0px;
        }
        div{
            width: 200px;
            height: 200px;
            color: #fff;
            font-size: 30px;
            text-align: center;
            line-height: 200px;
            
        }
        .box1{
            background: red;
            float: left;

        }
        .box2{
            background: blue;
            float: left;
        }
        .box3{
            background: green;
            float: left;
            height: 201px;
        }
        .box4{
            background: yellow;
            float: left;
            height: 150px;
        }
        .box5{
            background: pink;
            float: left;
            height: 150px;
        }
        .box6{
            background: red;
            float: left;

        }
    </style>
</head>
<body>
    <div class="box1">box1</div>
    <div class="box2">box2</div>
    <div class="box3">box3</div>
    <div class="box4">box4</div>
    <div class="box5">box5</div>
    <div class="box6">box6</div>
</body>
</html>